Explosive Welding-Final

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By: ezzatmonem (104 month(s) ago)

very good presentation

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Slide 1: 

EXPLOSION WELDING

Definition of Explosion Welding : 

A solid-state welding process that produces coalescence by high velocity interaction of the work pieces produced by a controlled detonation. standoff distance prime component Base component Detonator Explosive Component arrangement for explosion welding Definition of Explosion Welding

Principles of Explosion Welding : 

Welding arrangement consists of three components - Base component Prime component Explosive. Base component remains stationary, supported by anvil. prime component Base component Explosive Component arrangement for explosion welding Detonator Principles of Explosion Welding

Principles of Explosion Welding : 

Prime component is placed either parallel or at an angle to the base. Explosive is distributed over top surface of prime component. Upon detonation, prime component collides with base component to complete welding. Action between components during explosion welding. Prime component Jet Base component Weld Principles of Explosion Welding

Slide 5: 

Linnert, Welding Metallurgy, AWS, 1994

Process Variables and Controls : 

Variables Collision Velocity Collision Angle Prime Component Velocity These are Controlled By: Component Mass Explosive Charge Initial Geometry - Standoff Distance or Angle Process Variables and Controls Explosive Pressure V = charge velocity

Explosives Used for Welding : 

Explosives Used for Welding High Velocity 14750-25000 ft/s Trinitrotoluene (TNT) Cyclotrimethylenetrinitramine (RDX) Pentaerythritol tetranitrate (PETN) Composition B Composition C4 Primacord Low to Medium Velocity 4900-14750 ft/s Ammonium nitrate Ammonium nitrate sensitized with fuel oil Ammonium perchlorate Amatol Amatol and sodatol diluted with rock salt to 30 to 35% Dynamites Nitroguanidine Dilute PETN

Slide 8: 

Effect of Velocity on Explosion Weld Geometry Metals Handbook, ASM, 1983

Slide 9: 

In Parallel Arrangement Standoff = 1/2 to 1.0 times clad Courtesy AWS handbook

Slide 10: 

In Angular Arrangement Angle = 1 to 8 Degrees Metals Handbook, ASM, 1983

Slide 11: 

Wave Height Larger Standoff and Greater Angle Generally Leads to Greater Wave Heights

Slide 13: 

Courtesy AWS handbook

Slide 14: 

Typical metal combinations that can be explosion welded Source AWS handbook

Applications of Explosion Welding : 

Any metal of sufficient strength and ductility can be joined. Cladding flat plates constitutes the major commercial application. Can be used to clad cylinders on inside or outside surface. Transition joints can be made. Tube to tube sheet joints in heat exchangers. Applications of Explosion Welding

Slide 16: 

Finished vessel fabricated from explosion clad plate. Explosion welded 12 inch diameter 3003 aluminum to A106 grade B steel tubular transition joint. Courtesy AWS handbook

Slide 17: 

Plug Welding of a Tube within a Pressure Vessel Tube Sheet Courtesy AWS handbook

Slide 18: 

Courtesy AWS handbook Using Explosion to seal mechanical plug

Slide 19: 

Metals Handbook, ASM, 1983

Slide 20: 

Courtesy AWS handbook Explosive Pipe Welding

Slide 21: 

Thin Steel Thick Aluminum Explosion Welded Cut Strip/width of shoe Insert Nail Groove & Hole Form Shoe Backman, C “Method and a Blank for the Production of Horseshoes”, Patent 5,727,376 Mar 17, 1998 Explosion Bonding of Horseshoes Steel Aluminum

Slide 22: 

Projectile Welding of Aluminum Joseph, A., “Projectile Welding”, US Patent 5,474,226 Dec 12, 1995 Multi-Molecular Nucleation surface between projectile of same material and sheets

Slide 23: 

Questions

Slide 24: 

Homework Explosive Weld

Slide 25: 

PROCESS SELECTION

Process Selection : 

Process Selection Selection of solid state welding processes depends on the following factors: Performance of the welding processes under existing conditions Advantages of the processes involved Durability of the welds produced Materials to be welded Economic viability of the process

Advantages of Solid State Welding : 

Advantages of Solid State Welding Eliminates liquid phases Makes the joining of many dissimilar metal combinations possible Can be performed with little or no deformation in some cases Can be performed at very low temperatures in some cases Some solid state processes can weld large areas in a single welding operation Some processes are relatively rapid

Advantages of Solid State Welding : 

Eliminates liquid phases Example: cold welding, friction welding, ultrasonic welding, diffusion welding and explosion welding Advantages of Solid State Welding

Advantages of Solid State Welding : 

Makes the joining of many dissimilar metal combinations possible Example: friction welding, explosion welding, diffusion welding. Advantages of Solid State Welding

Advantages of Solid State Welding : 

Can be performed with little or no deformation in some cases Example: diffusion welding Advantages of Solid State Welding

Advantages of Solid State Welding : 

Some solid state processes can weld large areas in a single welding operation Examples: diffusion welding and explosion welding Advantages of Solid State Welding

Advantages of Solid State Welding : 

Some solid state welding processes are relatively rapid Example: ultrasonic welding, cold welding and friction welding Advantages of Solid State Welding

Slide 33: 

Homework Search Patent Literature

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